NEW BOOKS the author makes no attempt to formulate general rules for use in prediction of patterns. Chapter 8, High Resolution Mass Spectrometry by R. A. Saunders and A. E. Williams, gives details of apparatus and procedures for precise measurement of mass doublet separations. Many examples are given with actual spectra and typical analytical problems from the authors' laboratory which were solved by this technique are discussed. The Mass Spec-
Chapter 7 by F. W. McLafferty, Decompositions and Rearrangements of Organic Ions, is an empirical organic chemical approach to the correlation of mass spectra with structure in contrast to the physical chemical theoretical approach. Fragmentation reactions are arbitrarily subdivided by whether the ion or neutral fragment has an odd or even number of electrons and by the ring size in cyclic rearrangements. Although numerous examples are cited,
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trometry of Long-Chain Esters by R. Ryhage and E. Steinhagen gives spectra of a variety of such compounds representing a number of ester types. Discussion of qualitative features, including spectra of deuterated species, is given with emphasis on the features useful for proof of structure. In Chapter 10, H. M. Grubb and S. Meyerson discuss the Mass Spectra of Alkylbenzenes. The first part is a nearly verbatim repeat of an earlier paper by the latter author on the qualitative correlation of spectra with alkyl benzene structure and the use of this in structure identification. The last part of the paper is a longneeded review of the interesting studies, mostly by the authors, of the formation of C 6 H 5 + , C 7 H 7 + , C 7 H 8 + and cationated cyclopropane ions from a variety of aromatic hydrocarbons. Applications to Natural Products and Other Problems in Organic Chemistry by K. Biemann gives a detailed discussion of some of the techniques of chemical pretreatment of the sample to enhance the volatility and structure identification by combination of spectral and chemical knowledge. The discussions of the numerous examples, mainly peptides and alkaloids, provides a fascinating description of this powerful technique. Chapter 12 by A. Hood is a description of the classical molecular model of petroleum and the role played by mass spectrometry in the evaluation of this model. The final chapter by R. I. Reed is concerned with the mass spectra of terpenes. I t is indeed unfortunate that the editor elected to include this chapter, as the naivete and inaccuracies of the discussion in this chapter detract badly from the high quality of the rest of the book. The author glibly postulates fragmentation mechanisms from the spectra without benefit of appearance potential data, spectra of isotopically labeled compounds, metastable transitions, etc. (The author quotes the spectra of a labeled camphene to prove the mode of formation of m/e 93, completely ignoring the information in the same spectra with regard to the formation of the other principal ions.) Speculations of the reaction mechanism for ions that may be formed by simple bond break is frequently reasonable without such supporting data, but when the ion under consideration is not a structural unit of the original molecule, speculation on its mode of formation without other supporting evidence is foolhardy. Throughout the chapter, the author is under the mistaken impression that the assignment of the neutral fragments formed concurrently with an ion is proven by
